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Tsirkin" Cc: jasowang@redhat.com, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, virtio-dev@lists.oasis-open.org, wexu@redhat.com, jfreimann@redhat.com Subject: Re: [PATCH net-next v2 1/5] virtio: add packed ring definitions Message-ID: <20180910021322.GA10912@debian> References: <20180711022711.7090-1-tiwei.bie@intel.com> <20180711022711.7090-2-tiwei.bie@intel.com> <20180907094922-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20180907094922-mutt-send-email-mst@kernel.org> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Sep 07, 2018 at 09:51:23AM -0400, Michael S. Tsirkin wrote: > On Wed, Jul 11, 2018 at 10:27:07AM +0800, Tiwei Bie wrote: > > Signed-off-by: Tiwei Bie > > --- > > include/uapi/linux/virtio_config.h | 3 +++ > > include/uapi/linux/virtio_ring.h | 43 ++++++++++++++++++++++++++++++ > > 2 files changed, 46 insertions(+) > > > > diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h > > index 449132c76b1c..1196e1c1d4f6 100644 > > --- a/include/uapi/linux/virtio_config.h > > +++ b/include/uapi/linux/virtio_config.h > > @@ -75,6 +75,9 @@ > > */ > > #define VIRTIO_F_IOMMU_PLATFORM 33 > > > > +/* This feature indicates support for the packed virtqueue layout. */ > > +#define VIRTIO_F_RING_PACKED 34 > > + > > /* > > * Does the device support Single Root I/O Virtualization? > > */ > > diff --git a/include/uapi/linux/virtio_ring.h b/include/uapi/linux/virtio_ring.h > > index 6d5d5faa989b..0254a2ba29cf 100644 > > --- a/include/uapi/linux/virtio_ring.h > > +++ b/include/uapi/linux/virtio_ring.h > > @@ -44,6 +44,10 @@ > > /* This means the buffer contains a list of buffer descriptors. */ > > #define VRING_DESC_F_INDIRECT 4 > > > > +/* Mark a descriptor as available or used. */ > > +#define VRING_DESC_F_AVAIL (1ul << 7) > > +#define VRING_DESC_F_USED (1ul << 15) > > + > > /* The Host uses this in used->flags to advise the Guest: don't kick me when > > * you add a buffer. It's unreliable, so it's simply an optimization. Guest > > * will still kick if it's out of buffers. */ > > @@ -53,6 +57,17 @@ > > * optimization. */ > > #define VRING_AVAIL_F_NO_INTERRUPT 1 > > > > +/* Enable events. */ > > +#define VRING_EVENT_F_ENABLE 0x0 > > +/* Disable events. */ > > +#define VRING_EVENT_F_DISABLE 0x1 > > +/* > > + * Enable events for a specific descriptor > > + * (as specified by Descriptor Ring Change Event Offset/Wrap Counter). > > + * Only valid if VIRTIO_RING_F_EVENT_IDX has been negotiated. > > + */ > > +#define VRING_EVENT_F_DESC 0x2 > > + > > /* We support indirect buffer descriptors */ > > #define VIRTIO_RING_F_INDIRECT_DESC 28 > > > > These are for the packed ring, right? Pls prefix accordingly. How about something like this: #define VRING_PACKED_DESC_F_AVAIL (1u << 7) #define VRING_PACKED_DESC_F_USED (1u << 15) #define VRING_PACKED_EVENT_F_ENABLE 0x0 #define VRING_PACKED_EVENT_F_DISABLE 0x1 #define VRING_PACKED_EVENT_F_DESC 0x2 > Also, you likely need macros for the wrap counters. How about something like this: #define VRING_PACKED_EVENT_WRAP_COUNTER_SHIFT 15 #define VRING_PACKED_EVENT_WRAP_COUNTER_MASK \ (1u << VRING_PACKED_WRAP_COUNTER_SHIFT) #define VRING_PACKED_EVENT_OFFSET_MASK \ ((1u << VRING_PACKED_WRAP_COUNTER_SHIFT) - 1) > > > @@ -171,4 +186,32 @@ static inline int vring_need_event(__u16 event_idx, __u16 new_idx, __u16 old) > > return (__u16)(new_idx - event_idx - 1) < (__u16)(new_idx - old); > > } > > > > +struct vring_packed_desc_event { > > + /* Descriptor Ring Change Event Offset/Wrap Counter. */ > > + __virtio16 off_wrap; > > + /* Descriptor Ring Change Event Flags. */ > > + __virtio16 flags; > > +}; > > + > > +struct vring_packed_desc { > > + /* Buffer Address. */ > > + __virtio64 addr; > > + /* Buffer Length. */ > > + __virtio32 len; > > + /* Buffer ID. */ > > + __virtio16 id; > > + /* The flags depending on descriptor type. */ > > + __virtio16 flags; > > +}; > > Don't use __virtioXX types, just __leXX ones. Got it, will do that. > > > + > > +struct vring_packed { > > + unsigned int num; > > + > > + struct vring_packed_desc *desc; > > + > > + struct vring_packed_desc_event *driver; > > + > > + struct vring_packed_desc_event *device; > > +}; > > + > > #endif /* _UAPI_LINUX_VIRTIO_RING_H */ > > -- > > 2.18.0